Equivalent Moisture Content Table |
Relative Humidity |
|
Ambient Air Temperature - degrees Celsius and Fahrenheit |
|
|
C: |
-1.1 |
4.4 |
10.0 |
15.6 |
21.1 |
26.7 |
32.2 |
37.8 |
43.3 |
48.9 |
54.4 |
60.0 |
65.6 |
71.1 |
76.7 |
82.2 |
87.8 |
93.3 |
F: |
30 |
40 |
50 |
60 |
70 |
80 |
90 |
100 |
110 |
120 |
130 |
140 |
150 |
160 |
170 |
180 |
190 |
200 |
5 |
|
1.4 |
1.4 |
1.4 |
1.3 |
1.3 |
1.3 |
1.2 |
1.2 |
1.1 |
1.1 |
1.0 |
0.9 |
0.9 |
0.8 |
0.7 |
0.7 |
0.6 |
0.5 |
10 |
|
2.6 |
2.6 |
2.6 |
2.5 |
2.5 |
2.4 |
2.3 |
2.3 |
2.2 |
2.1 |
2.0 |
1.9 |
1.8 |
1.6 |
1.5 |
1.4 |
1.3 |
1.1 |
15 |
|
3.7 |
3.7 |
3.6 |
3.6 |
3.5 |
3.5 |
3.4 |
3.3 |
3.2 |
3.0 |
2.9 |
2.8 |
2.6 |
2.4 |
2.3 |
2.1 |
1.9 |
1.7 |
20 |
|
4.6 |
4.6 |
4.6 |
4.6 |
4.5 |
4.4 |
4.3 |
4.2 |
4.0 |
3.9 |
3.7 |
3.6 |
3.4 |
3.2 |
3.0 |
2.8 |
2.6 |
2.4 |
25 |
|
5.5 |
5.5 |
5.5 |
5.4 |
5.4 |
5.3 |
5.1 |
5.0 |
4.9 |
4.7 |
4.5 |
4.3 |
4.1 |
3.9 |
3.7 |
3.5 |
3.2 |
3.0 |
30 |
|
6.3 |
6.3 |
6.3 |
6.2 |
6.2 |
6.1 |
5.9 |
5.8 |
5.6 |
5.4 |
5.2 |
5.0 |
4.8 |
4.6 |
4.3 |
4.1 |
3.8 |
3.5 |
35 |
|
7.1 |
7.1 |
7.1 |
7.0 |
6.9 |
6.8 |
6.7 |
6.5 |
6.3 |
6.1 |
5.9 |
5.7 |
5.5 |
5.2 |
4.9 |
4.7 |
4.4 |
4.1 |
40 |
|
7.9 |
7.9 |
7.9 |
7.8 |
7.7 |
7.6 |
7.4 |
7.2 |
7.0 |
6.8 |
6.6 |
6.3 |
6.1 |
5.8 |
5.6 |
5.3 |
5.0 |
4.6 |
45 |
|
8.7 |
8.7 |
8.7 |
8.6 |
8.5 |
8.3 |
8.1 |
7.9 |
7.7 |
7.5 |
7.2 |
7.0 |
6.7 |
6.4 |
6.2 |
5.9 |
5.5 |
5.2 |
50 |
|
9.5 |
9.5 |
9.5 |
9.4 |
9.2 |
9.1 |
8.9 |
8.7 |
8.4 |
8.2 |
7.9 |
7.7 |
7.4 |
7.1 |
6.8 |
6.5 |
6.1 |
5.8 |
55 |
|
10.4 |
10.4 |
10.3 |
10.2 |
10.1 |
9.9 |
9.7 |
9.5 |
9.2 |
8.9 |
8.7 |
8.4 |
8.1 |
7.8 |
7.4 |
7.1 |
6.8 |
6.4 |
60 |
|
11.3 |
11.3 |
11.2 |
11.1 |
11.0 |
10.8 |
10.5 |
10.3 |
10.0 |
9.7 |
9.4 |
9.1 |
8.8 |
8.5 |
8.2 |
7.8 |
7.5 |
7.1 |
65 |
|
12.4 |
12.3 |
12.3 |
12.1 |
12.0 |
11.7 |
11.5 |
11.2 |
11.0 |
10.6 |
10.3 |
10.0 |
9.7 |
9.3 |
9.0 |
8.6 |
8.2 |
7.8 |
70 |
|
13.5 |
13.5 |
13.4 |
13.3 |
13.1 |
12.9 |
12.6 |
12.3 |
12.0 |
11.7 |
11.3 |
11.0 |
10.6 |
10.3 |
9.9 |
9.5 |
9.1 |
8.7 |
75 |
|
14.9 |
14.9 |
14.8 |
14.6 |
14.4 |
14.2 |
13.9 |
13.6 |
13.2 |
12.9 |
12.5 |
12.1 |
11.8 |
11.4 |
11.0 |
10.5 |
10.1 |
9.7 |
80 |
|
16.5 |
16.5 |
16.4 |
16.2 |
16.0 |
15.7 |
15.4 |
15.1 |
14.7 |
14.4 |
14.0 |
13.6 |
13.1 |
12.7 |
12.3 |
11.8 |
11.4 |
10.9 |
85 |
|
18.5 |
18.5 |
18.4 |
18.2 |
17.9 |
17.7 |
17.3 |
17.0 |
16.6 |
16.2 |
15.8 |
15.3 |
14.9 |
14.4 |
14.0 |
13.5 |
13.0 |
12.5 |
90 |
|
21.0 |
21.0 |
20.9 |
20.7 |
20.5 |
20.2 |
19.8 |
19.5 |
19.1 |
18.6 |
18.2 |
17.7 |
17.2 |
16.7 |
16.2 |
15.7 |
15.1 |
14.6 |
95 |
|
24.3 |
24.3 |
24.3 |
24.1 |
23.9 |
23.6 |
23.3 |
22.9 |
22.4 |
22.0 |
21.5 |
21.0 |
20.4 |
19.9 |
19.3 |
18.7 |
18.1 |
17.5 |
|
EMC Equation |
-The values in this table are calculated using the following formula: M = 1800/W [ Kh/(1-Kh) + (K1Kh + 2K1K2K2h2) / (1 + K1Kh + K1K2K2h2) ] |
--where |
|
M = moisture content
(%) |
W = 330 + 0.452T +
0.00415T2 |
|
|
|
T = temperature (oF) |
K = 0.791 + 0.000463T
- 0.000000844T2 |
|
|
|
h = relative
humidity(%/100) |
K1 = 6.34 + 0.000775T - 0.0000935T2 |
|
|
|
|
K2
= 1.09 + 0.0284T - 0.0000904T2 |
|
Source: U.S. Forest Products Laboratory, General Technical Report 113 |